"Of that total, over $295,000 was raised from July 1 – July 25 and was reported on the pre-primary FEC report. The remainder, over $2.42 million, was raised between July 26 and September 30," the campaign said in a statement.

Mack, who had raised $839,000 in the second quarter and had only $1.39 million in the bank by June 30, has relied on third party groups to assist him in the expensive ad wars while Nelson has funded most of his race himself.

Nelson had raised $13 million and had $11 million in the bank after the June reporting period ended. He has used it to finance attack ads against Mack that began in early August. The tactic has helped to repress any momentum Mack could have gotten after his primary victory over former Congressman Dave Weldon.

Update: Nelson reported raising $2.3 million for the quarter ending Sept. 30 and has $6.5 million on hand.

Polls continue to show Nelson with a steady lead. A WeAskAmerica poll on Monday had the two candidates tied, a Rasmussen Reports poll on the same day showed Nelson ahead by 11 points. The RealClearPolitics average shows Nelson still up by 5.6 points with a month left in the campaign.

Mack has been assisted by the conservative Americans for Prosperity, Karl Rove's Crossroads GPS Kentucky Republican Sen. Rand Paul's RAND PAC which have each run attack ads against Nelson.